hoefer



3 'sheets-.sheen 1.

(No Model.)

D. C. vSTOVER 8v F. W.. E. A. 8v A. HOEFER.

DRILLING MACHINE.

No. 506,865. Patented 001. 17, 1893.

j) im M11111111111111i (No Model.) l SSheetSfSheet 2.

' D. C. STOVER & F. W., E. A. 8v A. HOEFER.

DRILLING MACHINE. No. 506,865. Patented Oct. 17, 1893.

(No Model.) SSheets-Sheet 3.

' D. C. STOVER 8v I'. W., E. A. 8v A. HOEFER. Y

DRILLING MACHINE.

No. 506,865. Patented 001.. 17, 1893.

- 2 zw fi ,jfgwnmu/hwww@ I i' A I IMIHIIIIM d UNTTED STATES PATENTOFFICE.

DANIEL C. STOVER, FREDERICK W. HOEFER, EMIL A. HOEFER, AND AUGUSTHOEFER, OF FREEPORT, ILLINOIS, ASSIGNORS TO THE STOVER NOVELTY WORKS, OFSAME PLACE.

DRlLLlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 506,865, dated October17, 1893.

Application filed October 12,1892- Serial No. 448,655. (No model.)

To @ZZ whom t may concern: to receive motion through a belt from any Beit known that we, DANIEL C. STOVER, suitable source f power and isprovided at its FREDERICK W. HOEEER, EMIL A. HOEFER, other end with asliding pulley, P, having a and AUGUST HOEFER, citizens of the Unitedkey which moves in a groove, g, in the shaft,

States of America, residing at Freeport, in the the pulley being thusadapted to rotate with 55 county of Stephenson and State of Illinois,the shaft, and, at the same time, to move have jointly invented certainnew and useful longitudinally upon it as desired. The lon- ImprovementsinDrilling-Machines, of which gitudinal movement of the pulley, P', uponthe following is a specification. the shaft is controlled by means ofthe dero Our invention relates to improvements in vice illustrated inFigs. l, 2, 3, in which R is 6o drilling-machines of that class in whichmoan external ring moving longitudinally upon tion is communicated fromthe driving pula portion of the bearing of the shaft, C, and ley to thedrill-chuck through co-acting'fricprovided with a set screw sliding in agroove, tion devices adapted to be Yso adjusted with g', in the bearing,this screw being adapted reference to each other as to vary the speed toprevent rotation of the ring upon the bear- 65 of rotation of the chuck.ing, and also to fix the ring in any desired The invention is fullydescribed and eX- position thereon. The ring, R, is provided plained inthis specification and shown in With two arms r, r, parallel with theshaft, O, the accompanying drawings, in whichand having at the endopposite the ring, R,

zo Figure lis a side elevation of a drillingan integrally formedhalf-ring, or yoke, R', 7o machine embodying our improvements. Fig.lying in an annular groove, g2, in the hub of 2 is a vertical sectionthereof. Fig. Sis a View the pulley P. The longitudinal movement partlyin top plan and partly in horizontal of the ring, R,moves the pulley P',longitudisection illustrating the means for moving the nally upon theshaft, C, Without interfering z 5 adjustable element of the frictiondevices. in any Way with its rotation. 75 Fig. 4 is an enlargedelevation of the crank Wit-hin the upper end of the hollow standforraising and lowering the platen of the ard, B, is a vertical shaft, C',journaled in machine and the parts immediately connectsuitable bearingand adapted tobe moved up ed therewith. Fig. 5 is a horizontal sectionand down through slight limits in the man- 3o illustrating a device forraising and lowering ner hereinafter described, and on the upper So thedrill-chuck. Fig. 6 is a front elevation end of this shaft is mounted ahorizontal pulof a part of said device, the cap'being reley, P2,whoseplaneupperface maybe brought moved by a vertical section through theline into frictional contact with the cylindrical 6-6 Fig. 5; and Fig. 7is a vertical section face of the pulley, P', and when in such conof thebase of the machine illustrating the tact may be rotated by the rotationof said 85 means for raising'and lowering the vertical pulley. It isevident that the longitudinal shaft and the intermediate pulley of thefrio` movement of the pulley, P', upon its shaft tion device mountedthereon, the plane of must vary its distance from the center of thesection being at right angles to that in Fig. 2. pulley, P2, andcorrespondingly vary the speed 4o In these views, A is a supportingbase-*of of the rotation imparted to the pulley, P, by 90 suitable form,and B is a hollow vertical the pulley, P'. standard stepped in a socketin the base. Upon the upper portion of the vertical The standard isprovided at and near its upshaft, O2, is mounted apulley, P3, whoseworkper endwith arms, B' ,132, B3,formed integrally ing edge is incontact with the edge of the with it, the arm B', being provided with ahoripulley, P2, already described. The pulley, 9 5 zontal bearing whichsupports a shaft, C, and P3, is provided with an elongated hub extendthearms, B2, B3, being provided with vertical ing downward within thebearing formed at bearings lying in line with each other and supthe endof the arm, B2, and this hub and the porting a vertical shaft, O2. Theshaft, C, has shaft, O2, within it are connected by means 5oatoneendarigidly mounted pulley,P,adapted of a key permitting verticalsliding move- 100 ment of the shaft with reference to the pulley.Vertical movement of the pulley and its hub is prevented by means of ahorizontal pin, as, Fig. 2, lying partly in the bearing and partly in anannular groove in the hub.

On the lower end of the shaft, C2, is mounted a sleeve, S, so connectedwith the Yshaft that the vertical but not the rotary movement of theshaft is communicated to the sleeve. The sleeve, S, is formed at oneside with a vertical line of teeth forming a rack and engaging a pinion,P4, whose rotation raises and lowers the sleeve. The pinion, P4, ismounted on a sleeve, S', Fig. 5, journaled ina suitable horizontalbearing supported by the arm, B3, and on the outer end of this sleeve-ismounted a disk, D, formed with marginal notches, N. A cap, d, covers thedisk, D, and is held in placeby a bolt, b, lying within the sleeve, S',and passing through the pinion, P, and the arm, B3, which supports theentire device. A lever, L, passes through the side wall of the cap, d,and extends `outward from it in a radialline, the inner end of the leverbeing adapted to enter the notches N, N, in the disk, D, and beingprovided with a transverse pin, p, which prevents its escape from `thecap.` The leve`r,'L, is free to move in and out with reference to thecenter of the disk, D, and` forms, in use, a combined lever andgravitypawl, its weight beingl sufficient to engage it with the notchesof the disk when above :the center thereof, and to disengage it from thedisk when below the center. The lever thus forms a very convenient meansfor imparting step by step rotation to the disk, D, sleeve, S', andpinion, P4, and thereby raising and lowering the sleeve, S, whichcarries the drillchuck of the machine.

* The meansV above referred to, for raising and lowering the pulley, P2,are fully illus-` trated in Figs. 1, 2, and 7, in which Csis a verticalrod bearing at its upper end a socket, s,

which receives thelower end of the shaft, C',

of the pulley, P2, the rod, C3, being supported by a cam, K, formed witha groove, 7e, in which the lower end of the rod rests. The cam, K, ismounted on a horizontalshaft, C, journaled in a horizontal bearing, B4,lying in thebase of the machine and susceptible of vertical adjustmenttherein by means of bolts, b', b2, Figs. l and 7. On the outer end oftheshaft, C4, is rigidly fastened a transverse step, E,adapted to beoperated by the foot in such a way as to swing the cam, K, through aslight angular limit of motion. When the cam is in the position shown inFig. 2, the pulley, P2, is raised and is in frictional contact with thepulley, P'; but when the cam is at its opposite limit of motion, thepulley, P2, is dropped down out of contact with the pulley, P. Hence,when the cam is in one position, the rotation of the driving pulley, P,is transmitted through the pulleys, P', P2, to the pulley, P3, and whenthe cam is in its opposite position, the pulleys, P,

P', may rotate without transmitting any n10- tion to the pulley, P3, andthe drill-chuck.

Beneath the shaft, C2, is a work-supporting platen, F, provided withasplit-ring, F', encircling the standard and slidin g up and down uponit, the ring, F', being provided with a screw-threaded tightening bolt,f, having a crank or handle for turning it to tighten the ring upon thestandard and thus tosecure the platen in any desired position. A chain,G, having one of its ends secured to the ring, F', passes upward overasprocket-wheel, H, journaled in an attachment to the standard, andthence downward within the standard,its free end being provided with atubular weight, W, which encircles the rod, C3, and slides freely up anddown within the standard, this weight being adapted to counterbalaneethe platen andfaeilitate its adj ustment;u-ponithestandard. Thesprocket-wheel, H, is mounted upon the horizontal shaft, H', providedywith a'crank for its rotation and has on one of its faces a series ofinclined ratchet teeth h, adapted to engage a corresponding seriesofteetlrformed upon the ear or projection which supports one end of theshaft, H', and presses iny one direction against the sprocket-wheel, H,in such a way as to tend to bring the teeth, h, of

the sprocket-wheel into engagement with the teeth, 71.', upon thestationarysupport..4 When these teeth are in engagement, the ratchetwheel may be 4turned ina direction adapted i to raise the platen but issecured by the teeth against reverse rotation. When the platen has uponit a heavy load of work sufficient to over-balance the weight, W, it maybe raised by means of the crank and sprocket-wheel, but ateach step islocked against any tendency to drop down. l When it is desired to lowerit, however, a slight longitudinal movement of the shaft, H', andsprocket-wheel, H, against the force of the spring, is sufficient towithdraw teeth, It, from engagement with the teeth, 7L', and as soon asthis engagement is broken the platen may be lowered.

As shown in the drawings, the pulleys, P', P3, are faced with leather orother suitable material adapted to increase their friction when incontact with the intermediate pulley, P2, andwe havefound the use ofsuch a facing advantageous in practice. Thisfeature of construction,however, constitutesA no part of our invention. Y The shaft, C', whichcarries the pulley, P2, may be supported in any `suitable bearings, butwe prefer such a lconstruction as will permit lateral adjustment of theshaft inorder to preserve the contact of the pulleys, P2,P3. Fig. 2shows a device'for thispurpose, M being a bearing plate secured to thetop ofthe standard by means `of bolts, m, m, passing throughlongitudinal slots of slight extent formed in the bearing plate.Anadjusting bolt, m', passes horizontally through one end of the bearingplate and abuts against the corresponding bolt, m, the `rotation ofthebolt,

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m', being evidently adapted to draw the plate, M, in either direction,and the bolts, m, fm, being adapted to secure the plate in any desiredposition.

In order to hold the sleeve, S, at any desired elevation, We have foundit desirable to provide it with a friction bolt, m2, Fig. 2, passinginvention, what we claim as new, and desire to secure by Letters Patent,is

1. The combination with the standard, the shaft, C2, journaled insuitable bearings thereon, and means substantially as shown anddescribed, for rotating said shaft, of the chuck-supporting sleeve, S,sliding on the shaft and rotating therewith, the pinion, P4, engagingteeth upon the sleeve, the notched disk, D, rigidly connected with thepinion, and the gravity lever, L, adapted to engage the notches in thedisk and to serve as means for rotating the disk and pinion and raisingand lowering the sleeve; substantially as shown and described.

2. The combination with the shaft, O2, sliding sleeve, S, and pinion,P4, of the notched disk, D, rigidly connected with the pinion, therotating case, d, inclosing the disk, and the gravity lever, L, passingthrough and projecting from the case and provided with a pin, lo,preventing its escape from the case, the inner end of the lever beingadapted to engage the notches in the disk; substantially as shown anddescribed.

8. The combination with the hollow standard, B, the drill-carryingshaft, C2, supported therein and means for rotating said shaft, of theplaten, F, provided with the ring, F', sliding upon the standard andhaving means for clamping it thereon, the sprocket-wheel, H, supportedby the standard, the chain, G, fastened at one end to the platen andpassing over the sprocket-wheel, and the Weight, W, lying withing thestandard and fastened to the end of the chain, said weight being adaptedto move up and down within the standard and balance the weight of theplaten; substantially as shown and described.

4. The combination With the hollow standard, B, the platen, F, means forsecuring it at any given point upon the standard, of the sprocket-wheel,H, supported by the standard, the chain, G, passing over and engagingthe sprocket wheel and fastened at one end to the platen, the weight, W,fastened to the opposite end of the chain to balance the weight of theplaten, and a suitable crank attached to the sprocket-wheel and adaptedto rotate it in'either direction and thereby to raise and lower theplaten; substantially as shown and described.

5. The combination with the standard and the drill-carrying anddrill-operating mechanism supported thereby, of the verticallyadjustable platen, F, the weight W, the chain, G, having its endsfastened to said weight and platen, respectively, the sprocket-wheel, H,mounted on the standard and supporting the chain, G, co-acting teethformed on the sprocket-Wheel and standard and adapted to lock thesprocket-wheel against rotation, and a spring adapted to maintain theengagement of said teeth and to yield to pressure and permit thedisengagement thereof and the free rotation of the sprocket-wheel;substantially as shown and described.

6. The combination with the standard, B, the drill-carrying shaft andmeans for rotating the same, of the platen F, the sprocketwheel, I-I,provided with ratchet teeth, h, on its face, the weight, W, the chain G,passing over the sprocket-wheel and having its ends fastened to theplaten and weight respectively, the crank for rotating the sprocketwheeland the spring, h2, adapted to press the teeth, h, of the sprocket-wheelinto engagement with corresponding teeth upon thestandard and lock thesprocket-wheel against rotation substantially as shown and described.

7. The combination with the hollow standard, the driving shaft, G, andadjustable pul-Y ley, P', of the shaft, C', the pulley, P2, mountedthereon, the cam, K, supporting the shaft, G', the shaft, G4, supportingthe cam, the bearing B4, supporting the shaft, C4, and meanssubstantially as shown and described for rocking the shaft, C4, and thecam, K, and raising and lowering the shaft, G', substantially as. shownand described.

8. The combination with the standard, the shaft, C, the adjustablepulley, P', the shaft, G', and the pulley, P2, mounted thereon, of thevertically adjustable horizontal box, B4, the shaft, C4, journaledtherein and provided with means for rocking, and the cam, K, mounted onthe shaft, C4, andv supporting the weight of the shaft, G', the rockingof the shaft, G4, and cam, K, being adapted to raise and lower thepulley.

DANIEL C. STOVER. FREDERICK W. HOEFER. EMIL A. HOEFER. AUGUST HOEFER.

Witnesses:

H. H. ANTRIM, W, C. OsTEN.

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